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namespace_cluster.go
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namespace_cluster.go
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// Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package server
import (
"math/rand"
"github.com/pingcap/pd/server/core"
"github.com/pingcap/pd/server/namespace"
"github.com/pingcap/pd/server/schedule"
)
// namespaceCluster is part of a global cluster that contains stores and reigons
// within a specific namespace.
type namespaceCluster struct {
schedule.Cluster
classifier namespace.Classifier
namespace string
stores map[uint64]*core.StoreInfo
}
func newNamespaceCluster(c schedule.Cluster, classifier namespace.Classifier, namespace string) *namespaceCluster {
stores := make(map[uint64]*core.StoreInfo)
for _, s := range c.GetStores() {
if classifier.GetStoreNamespace(s) == namespace {
stores[s.GetId()] = s
}
}
return &namespaceCluster{
Cluster: c,
classifier: classifier,
namespace: namespace,
stores: stores,
}
}
func (c *namespaceCluster) checkRegion(region *core.RegionInfo) bool {
if c.classifier.GetRegionNamespace(region) != c.namespace {
return false
}
for _, p := range region.Peers {
if _, ok := c.stores[p.GetStoreId()]; !ok {
return false
}
}
return true
}
const randRegionMaxRetry = 10
// RandFollowerRegion returns a random region that has a follower on the store.
func (c *namespaceCluster) RandFollowerRegion(storeID uint64) *core.RegionInfo {
for i := 0; i < randRegionMaxRetry; i++ {
r := c.Cluster.RandFollowerRegion(storeID)
if r == nil {
return nil
}
if c.checkRegion(r) {
return r
}
}
return nil
}
// RandLeaderRegion returns a random region that has leader on the store.
func (c *namespaceCluster) RandLeaderRegion(storeID uint64) *core.RegionInfo {
for i := 0; i < randRegionMaxRetry; i++ {
r := c.Cluster.RandLeaderRegion(storeID)
if r == nil {
return nil
}
if c.checkRegion(r) {
return r
}
}
return nil
}
// GetStores returns all stores in the namespace.
func (c *namespaceCluster) GetStores() []*core.StoreInfo {
stores := make([]*core.StoreInfo, 0, len(c.stores))
for _, s := range c.stores {
stores = append(stores, s)
}
return stores
}
// GetStore searches for a store by ID.
func (c *namespaceCluster) GetStore(id uint64) *core.StoreInfo {
return c.stores[id]
}
// GetRegion searches for a region by ID.
func (c *namespaceCluster) GetRegion(id uint64) *core.RegionInfo {
r := c.Cluster.GetRegion(id)
if r == nil || !c.checkRegion(r) {
return nil
}
return r
}
// RegionWriteStats returns hot region's write stats.
func (c *namespaceCluster) RegionWriteStats() []*core.RegionStat {
allStats := c.Cluster.RegionWriteStats()
stats := make([]*core.RegionStat, 0, len(allStats))
for _, s := range allStats {
if c.GetRegion(s.RegionID) != nil {
stats = append(stats, s)
}
}
return stats
}
func scheduleByNamespace(cluster schedule.Cluster, classifier namespace.Classifier, scheduler schedule.Scheduler) *schedule.Operator {
namespaces := classifier.GetAllNamespaces()
for _, i := range rand.Perm(len(namespaces)) {
nc := newNamespaceCluster(cluster, classifier, namespaces[i])
if op := scheduler.Schedule(nc); op != nil {
return op
}
}
return nil
}